S2.2 The covalent model Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. What is the shape of a BF₃ molecule?
- A. Trigonal pyramidal
- B. Trigonal planar
- C. Tetrahedral
- D. Bent
2. Which molecule is polar?
- A. CCl₄
- B. CO₂
- C. CHCl₃
- D. BF₃
3. Which substance has hydrogen bonding between its molecules?
- A. CH₄
- B. HCl
- C. CH₃OCH₃
- D. NH₃
4. A spot moves 3.0 cm while the solvent front moves 7.5 cm. What is its Rf?
- A. 0.40
- B. 2.5
- C. 0.60
- D. 4.5
5. Why is graphite used as a lubricant?
- A. It has delocalised electrons
- B. Its layers are held by weak forces and can slide
- C. It has a high melting point
- D. Each carbon forms four bonds